What do you _____ the transportation in your city? [ ]

A. think over

B. think about

C. think of

D. think to

性联丙球蛋白缺乏症（Bruton综合征）患者的骨髓中很难找到的细胞是（）

A.骨髓干细胞

B.T细胞

C.中性粒细胞

D.浆细胞

E.单核细胞